classmates=("jack","bob","tom")
print(‘classmates=‘,classmates)
print(‘classmates[0]=‘,classmates[0])
print(‘classmates[1]=‘,classmates[1])
print(‘classmates[2]=‘,classmates[2])
print(‘classmates[-1]=‘,classmates[-1])
classmates[1]="spider man"
print classmates
原文：http://blog.51cto.com/546136/2061114